30W Class A Linear RF amplifier for 2.304GHz ham band requiring only 10mW input.

Description

30W Class A Linear RF amplifier for 2.304GHz ham band requiring only 10mW input.
This is for one very linear Class A RF amplifier which I have removed from a new Spectrian high power Amp where it was used for driver for the main PA boards. This amplifier has been selected, setup and tested for an output power of 30W @ 2.304GHz with a linear gain of 35dB. Input power for 30W output is typically 10mW or less! I have attached a plot of power vs frequency. The upper left reference tick marks the 100W (50dBm) point with 5dBm / vertical division. Frequency is 50MHz / division. Input drive for this example was 7.0dBm. Power requirement is 13-14V @ 10A and + 18 to +28v bias @ 50Ma. This bias is used for the gate voltage circuit on the power control FET. I do supply a miniature regulated DC-DC converter with this auction which takes 12-15v input with an output of 12v @ 85ma for generating this bias voltage by putting the isolated output in series with this 12v input voltage. Please note! You must put a 47 ohm resistor in series with the output of this converter then connect the other end to pin 14. This protects the DC converter from inrush current into the 4.7uF tantalum on the amp. board. There is a logic level enable pin which requires grounding to enable power to this amplifier and can be used for a PTT/KEY control. The connector also has a direct temperature output pin with the function 10.0mV/degree F which measures the board temperature close to the 30W RF output GaAs FET (NEC S2527-30). Note that the output of this amplifier is protected by an internal 125W isolator! Here are the pin functions for the DC bias connector: Pins 1,2,3,4 are all +12.6 to 13Vdc @ 7.5 or so amps. Pins 5,6,7,8,10 are all ground. Pins 12,13 are N.C. Pin 11 is Logic level Low enable, normally floats high. This turns on the +12v to the internal transistors. Pin 14 is + 26V bias supply input @ 50Ma. Pin 9 indicates temperature = 10mV/degree F. This board comes mounted on a 1/4 inch thick aluminum heat spreader which has 6 mounting holes for mounting to a heat-sink. I am also supplying the 2 MCX .086 hard-line sections as well as the mating bias connector as shown. You will find it very easy to remove one of the MCX connectors from one end of these and replace it with a SMA .086 hard-line connector. Board dimensions are 6.5 x 4 inches.
Florida buyers must add 7% (or actual amount for your county) sales tax or mail me a signed photocopy of your Florida Resale Certificate with your payment! I do combine auction winnings when ever possible to save buyers money. I do ask that buyers help keep track of any auction shipments they want to combine and email me for a total when they are ready. Fixed Priority S&H quoted prices are for 50 USA states. International Bidders pay actual S&H. Good luck bidding! KI4NPV
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